2N4409

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Silicon unijunction transistor (UJT) housed in a plastic TO-92 package, engineered with specialized interbase resistance and peak current properties for precision industrial relaxa tion oscillators and timing circuits. Equivalents: 2N4871, NTE6401 (Note: Modern designs typically deploy a programmable UJT like the 2N6027 with external configuration resistors instead). Real-Life Examples: Vintage electronic alarm chimes, thyristor/SCR phase-control gate trigger modules, and time-delay automation relays. Show more